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https://wiki.archlinux.org/index.php/Steam#Steam_runtime_issues
Seems to be the most common issue people have with Steam not launching.
If you're running Ubuntu, this more than likely isn't your problem. Steam is targeted at Ubuntu so it shouldn't have weird library issues like this with it.
Make a new thread about the issue you're having, paste your terminal output in there, then post a link here so I can find it. You'll get a lot more help that way.
Ubuntu 15.04 is based on Debian Unstable and obviously has more recent versions.